The attorney appointed to represent Hermilo Benitez Serrato has moved for *408 leave to withdraw and has filed a brief in accordance with Anders v. California, 386 U.S. 738, 87 S.Ct. 1396, 18 L.Ed.2d 493 (1967), and United States v. Flores, 632 F.3d 229 (5th Cir. 2011). Benitez Serrato has filed a response. The record is insufficiently developed to allow consideration at this time of Benitez Serrato’s claims of ineffective assistance of counsel; such claims generally “cannot be resolved on direct appeal when the claim has not been raised before the district court since no opportunity existed to develop the record on the merits of the allegations.” United States v. Cantwell, 470 F.3d 1087, 1091 (5th Cir. 2006) (internal quotation marks and citation omitted). We have reviewed counsel’s brief and the relevant portions of the record reflected therein, as well as Benitez Serrato’s response. We concur with counsel’s assessment that the appeal presents no nonfrivolous issue for appellate review. Accordingly, counsel’s motion for leave to withdraw is GRANTED, counsel is excused from further responsibilities herein, and the APPEAL IS DISMISSED. See 5th Cir. R. 42.2. Benitez Serrato’s motion to appoint new appellate counsel is DENIED. Cf. United States v. Wagner, 158 F.3d 901, 902-03 (5th Cir. 1998).